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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0daa7ced401b2343a8887386ca0ec2880a8a02f3204e4c31db24731841623d' 
  AND token = 'XcyskGCp56/DIKjfIqB0WoLAVIDnrwAm4TAFAhbAOJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}